Brewing tank



FIG. 1 is a front view of a brewing tank showing my new design;

FIG. 2 is a rear view of the brewing tank; and,

FIG. 3 is a top view of the brewing tank.

The broken lines in the drawing depict portions of the brewing tank that form no part of the claimed design. 

CLAIM The ornamental designs for a brewing tank, as shown and described. 